Tehran University of Medical Sciences The Research in Heart Yield and Translational Medicine (RHYTHM) 3115-7270 13 2 2018 05 23 58 64 EN Afsaneh Shafiei Department of Biochemistry, Payame Noor University of Tehran, Tehran, Iran. Younes Pilehvar-Soltanahmadi Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran. Shayan Ziaee Tehran Heart Center, Tehran Unversity of Medical Sciences, Tehran, Iran. Mohsen Mofarrah Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran. Nosratollah Zarghami Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran. 2016 08 01 2017 06 22 Background: Recently, rs9289231 genetic variations of kalirin (KALRN) have been introduced as potential genetic markers for coronary artery disease (CAD). However, the influence of KALRN single-nucleotide polymorphisms (SNPs) on serum kalirin levels has not been investigated in CAD patients so far. Thus, the present study aimed to survey whether SNP T > G (rs9289231) was associated with the risk of early-onset CAD and serum kalirin levels among the study subjects. Methods: The rs9289231 polymorphism of the KALRN was genotyped in 512 subjects (61.5% male, mean age = 46.3 ± 7.1 y), comprising 268 subjects with angiographically diagnosed CAD and 244 controls using an HRM assay. Also, the levels of serum kalirin were compared between 133 CAD subjects and 123 controls using a sandwich ELISA assay.  Results: The CAD subjects had more frequently GG genotypes than the controls. The odds ratio (OR) remained significant after adjustment for known CAD risk factors (OR = 4.13, 95% CI: 2.48–9.10; p value < 0.001). A significant difference was also observed in that the G allele was more frequent among the CAD subjects. The G allele at the rs9289231 polymorphism was associated with a higher risk of CAD (OR = 2.11, 95% CI: 1.27–2.59; p value = 0.001). The mean kalirin level of the CAD patients was higher than that of the controls (p value = 0.041). No significant correlation was seen in the different genotypes with serum kalirin levels. Conclusion: The KALRN rs9289231 T > G variant was considerably related with an increased risk of early-onset CAD.  High kalirin levels were found in young CAD patients compared to the control subjects, with the levels not affected by the different genotypes of rs9289231. https://rhythm.tums.ac.ir/index.php/jthc/article/view/594 https://rhythm.tums.ac.ir/index.php/jthc/article/download/594/653